Size Name:Pack of 3 "Just Choose IZOKEE: Your expert for Micro-Electronics! One-Stop-Shopping with Various Electronic Modules and Components! " How to use? 1. Download the Arduino IDE, the latest version.  2. Install the IDE 3. Set up your Arduino IDE as: Go to File->Preferences and copy the URL below to get the ESP board manager extensions: http://arduino.esp8266.com/stable/package_esp8266com_index.json. Placing the http:// before the URL lets the Arduino IDE use it...otherwise it gives you a protocol error. 4. Go to Tools > Board > Board Manager> Type "esp8266" and download the Community esp8266 and install.  5. Set up your chip as: Tools -> Board -> NodeMCU 1.0 (ESP-12E Module) Tools -> Flash Size -> 4M (3M SPIFFS) Tools -> CPU Frequency -> 80 Mhz Tools -> Upload Speed -> 921600 Tools -> Port -> (whatever it is) 6. Download and run the 32 bit flasher exe at Github (Search for nodemcu/nodemcu-flasher/tree/master/ at Github) github.com/nodemcu/nodemcu-flasher/tree/master/Win32/Release Or download and run the 64 bit flasher exe at: github.com/nodemcu/nodemcu-flasher/tree/master/Win64/Release 7. In Arduino IDE, look for the old fashioned Blink program. Load, compile and upload.  8. Go to FILE> EXAMPLES> ESP8266> BLINK, it will start blinking.  Package Included: 3 x NodeMcu Lua ESP-12E WIFI Development Board
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